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Reap connections based on owning-thread death
.. not a general timeout. Now, if a thread checks out a connection then dies, we can immediately recover that connection and re-use it. This should alleviate the pool exhaustion discussed in rails#12867. More importantly, it entirely avoids the potential issues of the reaper attempting to check whether connections are still active: as long as the owning thread is alive, the connection is its business alone. As a no-op reap is now trivial (only entails checking a thread status per connection), we can also perform one in-line any time we decide to sleep for a connection. Conflicts: activerecord/CHANGELOG.md
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